feat: TTLock — add Учетная запись + Пароль fields for OAuth

Per Sciener docs: OAuth requires TTHotel account credentials (Учетная запись + Пароль)
separate from developer app client_id/client_secret.

- Migration 055: add ttlock_username, ttlock_password columns
- Backend: store and pass new fields to agent
- UI: add input fields matching TTHotel PMS integration page
- Agent: getAccessToken() uses ttlockUsername/ttlockPassword when provided

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/api.ts

@@ -1094,18 +1094,21 @@ export interface Workstation {
 }
 
 export interface TTLockConfig {
-  isEnabled:   boolean
-  clientId:    string
-  cardSectors: string
-  apiServer:   string
+  isEnabled:      boolean
+  clientId:       string
+  cardSectors:    string
+  apiServer:      string
+  ttlockUsername: string
 }
 
 export interface TTLockConfigUpdate {
-  isEnabled?:    boolean
-  clientId?:     string
-  clientSecret?: string
-  cardSectors?:  string
-  apiServer?:    string
+  isEnabled?:       boolean
+  clientId?:        string
+  clientSecret?:    string
+  ttlock_username?: string
+  ttlock_password?: string
+  cardSectors?:     string
+  apiServer?:       string
 }
 
 export interface RoomLockMapping {